If the natural background is not fully optimal, you can use a photo background. This Lastolite photo background weighs 7.34 kg, which makes it nice and sturdy.
Lastolite Super White Vinyl For Highlight 180
Manfrotto LL LB8868 Cleanable Vinyl Train for the 1.8 x 2.15 m HiLite
Lastolite Hilite Background 1.8 x 2.15m